ADOBE PREMIERE PRO 2.0
User Guide
289
Channel Blur effect
The Channel Blur effect blurs a clip’s red, green, blue, or alpha channels individually. You can specify that the blur is
horizontal, vertical, or both. Use this effect for glow effects or if you want a blur that does not become transparent
near the edges of the clip. The Edge Behavior option describes how to treat the edges of a blurred image. If you
deselect it, pixels outside of the image are transparent, which makes the edges of the blurred image semitransparent.
Select the Repeat Edge Pixels option to repeat the pixels around the edges, preventing the edges from darkening and
becoming more transparent.
Compound Blur effect
The Compound Blur effect blurs pixels in the selected clip based on the luminance values of a Blur Layer, also known
as a blurring map. The Blur Layer can be any clip that contains pixels of different luminance values. It is overlaid on
top of the selected clip, and the pixels of both clips are matched, one to one. Where the Blur Layer is black, no blurring
occurs in the same location in the selected clip. The Blur Layer is used only as a map; it is not visible in the compo-
sition.
Compound Blur effect: Original (left), with Compound Blur applied (center), and with Compound Blur applied and the cloud layer made
invisible (right)
This effect is useful for simulating smudges and fingerprints, or changes in visibility caused by atmospheric condi-
tions such as smoke or heat, especially with animated blurring layers. Use the following controls:
Blur Layer
Specifies the clip in the sequence to use as the blurring map. Bright values in the Blur Layer correspond
to more blurring of the affected clip, while dark values correspond to less blurring.
Maximum Blur
Specifies the maximum amount, in pixels, that any part of the affected clip can be blurred.
Stretch Map To Fit
Stretches the Blur Layer to the dimensions of the clip to which it is applied; otherwise, it is
centered.
Invert Blur
Inverts the values, so areas that were previously more blurred are less blurred, and vice versa.
Directional Blur effect
The Directional Blur effect performs a directional blur on an image, giving a clip the illusion of motion.
The Directional Blur effect has the following settings:
Direction
Specifies the direction of the blur. The blur is applied equally around a pixel’s center; therefore, a setting
of 180˚ and a setting of 0˚ look the same.
Blur Length
Specifies how much to blur the image.
Fast Blur effect
Use the Fast Blur effect to specify how much to blur an image. You can specify that the blur is horizontal, vertical, or
both. Fast Blur blurs areas more quickly than Gaussian Blur.